/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.core;



import com.bff.gaia.unified.sdk.state.State;

import com.bff.gaia.unified.sdk.state.WatermarkHoldState;

import org.joda.time.Instant;



import java.util.HashSet;

import java.util.Map;

import java.util.Set;



/** Simulates state like {@link InMemoryStateInternals} and provides some extra helper methods. */

public class TestInMemoryStateInternals<K> extends InMemoryStateInternals<K> {

  public TestInMemoryStateInternals(K key) {

    super(key);

  }



  public Set<StateTag> getTagsInUse(StateNamespace namespace) {

    Set<StateTag> inUse = new HashSet<>();

    for (Map.Entry<StateTag, State> entry : inMemoryState.getTagsInUse(namespace).entrySet()) {

      if (!isEmptyForTesting(entry.getValue())) {

        inUse.add(entry.getKey());

      }

    }

    return inUse;

  }



  public Set<StateNamespace> getNamespacesInUse() {

    return inMemoryState.getNamespacesInUse();

  }



  /** Return the earliest output watermark hold in state, or null if none. */

  public Instant earliestWatermarkHold() {

    Instant minimum = null;

    for (State storage : inMemoryState.values()) {

      if (storage instanceof WatermarkHoldState) {

        Instant hold = ((WatermarkHoldState) storage).read();

        if (minimum == null || (hold != null && hold.isBefore(minimum))) {

          minimum = hold;

        }

      }

    }

    return minimum;

  }

}